From mboxrd@z Thu Jan  1 00:00:00 1970
From: "Shawn O. Pearce" <spearce@spearce.org>
Subject: Re: Problem creating commits/trees with commit-tree/mktree
Date: Mon, 11 Jan 2010 10:17:12 -0800
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To: Gavin Beatty <gavinbeatty@gmail.com>
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Gavin Beatty <gavinbeatty@gmail.com> wrote:
> I want to write commits to a branch without touching the index or
> having a checkout (for a git subcommand I'm writing).
> 
> I can create new blobs and trees but can't figure out how to commit a
> new tree/blob _with_ the old tree.
> 
> Currently, I do something a lot like:
> 
> objsha=$(echo 'contents' | git hash-object -w --stdin)
> objtreesha=$(printf "100644 blob $objsha\tfile.txt\000" | git mktree -z)
> newtreesha=$(printf "040000 tree $objtreesha\ttreefileisin\000" | git mktree -z)

You aren't feeding in the old tree contents as part of this command.

If you are really doing this via a script, you should look at
git-fast-import.  Its faster, and its language better supports
this notion of editing an existing tree.

-- 
Shawn.